I liked his Pastwatch on Christopher Columbus, but the idea that people in the future create religious visions in the past is a dicey theory to base a book on.
If he is so concerned about keeping society stable by protecting marriage, then he should more seriously think about the role religion and faith plays in keeping societies stable.
By stable, I don't mean hidebound; but there are laws of physics that if you press the boundaries with too much force you will spin out of orbit.
On the other hand, the Rings and Harry Potter movies do bring the books to life.